body {
  margin: 0;
  font-family: sans-serif;
  color: #eaffff;
  text-align: center;

  background: radial-gradient(circle at center, #001a1a, #000000 70%);
  overflow-x: hidden;
  overflow-y: auto;
}

/* ✨ ENERGÍA ASCENDENTE */
body::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;

  background: linear-gradient(
    to top,
    rgba(0,255,200,0.05),
    transparent
  );

  animation: subir 4s infinite ease-in-out;
  pointer-events: none;
}

@keyframes subir {
  0% { transform: translateY(20px); opacity: 0.6; }
  50% { transform: translateY(-20px); opacity: 1; }
  100% { transform: translateY(20px); opacity: 0.6; }
}

/* CONTENIDO */
.contenido {
  position: relative;
  z-index: 2;

  max-width: 800px;
  margin: auto;
  padding: 100px 20px;
}

/* ☊ SIMBOLO */
.simbolo {
  font-size: 130px;
  color: #00ffcc;

  animation: crecer 3s infinite ease-in-out;

  text-shadow:
    0 0 10px #00ffcc,
    0 0 20px #00ffcc,
    0 0 40px #00ffaa;
}

@keyframes crecer {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* TEXTO */
h1 {
  font-size: 46px;
  margin: 20px 0;
}

p {
  font-size: 18px;
  line-height: 1.8;
}

/* BOTON */
.volver {
  display: inline-block;
  margin-top: 40px;
  padding: 12px 25px;

  border: 1px solid #00ffcc;
  color: #00ffcc;
  text-decoration: none;

  transition: 0.3s;
}

.volver:hover {
  background: #00ffcc;
  color: black;
  box-shadow: 0 0 25px #00ffcc;
}

/* 📱 RESPONSIVE */
@media (max-width: 768px) {
  .simbolo { font-size: 85px; }
  h1 { font-size: 30px; }
  p { font-size: 16px; }
}